Corteus writing

Decisions that matter before
and after the first commit.

A deliberately small library for deciding what deserves a company, what must be true before building, and what can still kill it in production.

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Editorial cover reading Evidence-native regulated operations, the company we would co-build
Sep 4, 2026 · 14 min

Evidence-native regulated operations: the company we would co-build

Corteus's working venture thesis. In regulated operations the costly step is proving an answer, not producing it. What a partner brings, and when we stop.

venture thesis / regulated operations
A checklist comparing AI product evals against real customer streets
Jul 10, 2026 · 8 min

What a real eval suite looks like, and how to ask for it

A plain-English guide for investors and non-technical founders on what AI evals are, what a real suite contains, and how to tell evidence from theater.

AI evaluation / AI due diligence
An investor listening for technical red flags behind a polished AI startup demo
Jul 9, 2026 · 8 min

AI startup red flags: the technical ones investors miss

Eight technical AI startup red flags non-technical investors can catch by ear in a pitch, with the follow-up question that confirms each one.

investing / AI due diligence
Two diligence checklists, one for software code and one for AI behavior
Jul 6, 2026 · 8 min

AI due diligence vs software due diligence

Why AI deals break standard software diligence: 4 gaps code scans miss, from eval quality to wrapper depth, before investors write a check this month.

AI due diligence / software diligence
An investor reviewing an AI startup pitch with a checklist
Jul 6, 2026 · 8 min

How to evaluate an AI startup without a technical background

A no-code investor guide with 6 questions, good and bad answer patterns, and when to bring one engineer in before a term sheet or check for AI seed deals.

AI due diligence / investing
A thin AI app layer tested against a larger foundation model release
Jul 6, 2026 · 7 min

The Wrapper Test: will this AI product survive the next model release?

An 8-question Wrapper Test for investors: how to tell whether an AI product has data, workflow depth, evals, and customers a model release cannot copy.

AI wrappers / AI investing
Five doors side by side, each a different AI agent platform choice
Jul 4, 2026 · 7 min

AI agent platforms compared, before you commit

Compare AWS Bedrock AgentCore, OpenAI, Claude with MCP, LangGraph, and custom builds on lock-in, cost, and control before OpenAI's August 26, 2026 shutdown.

AI agents / platforms
A fork in the road between buying an AI platform and building one in-house
Jul 4, 2026 · 7 min

Build vs buy for AI products

A build vs buy framework for AI products: why 76% of enterprise AI is now bought, when building wins anyway, and the switching-cost math founders skip.

build vs buy / AI strategy
Three diverging paths representing three ways to get an AI product built
Jul 4, 2026 · 7 min

Fractional CTO vs dev agency vs technical co-founder

Fractional CTOs bill $150 to $500 an hour, US agencies charge $100 to $149, and a co-founder search can take a year. What each option really costs you.

founders / hiring
Stacked cost bars comparing an AI MVP budget to a regulated production system budget
Jul 4, 2026 · 7 min

How much does it cost to build an AI product in 2026

A verified 2026 cost breakdown for building an AI product: salaries, per-token API prices, data work, and why regulated systems cost 3 to 10 times more.

AI costs / founders
A magnifying glass held over a polished product demo screen
Jul 4, 2026 · 8 min

How to evaluate an AI startup's technology before investing

Five questions that reveal whether an AI startup's technology is real before you invest, and what honest answers sound like when $445 million is at stake.

investing / AI due diligence
A checklist beside a vendor contract and a padlock
Jul 4, 2026 · 8 min

Questions to ask an AI vendor about security

Seven security questions to ask any AI vendor before you sign, with the good answer and the dodge for each, from training data to SOC 2 and incident history.

AI security / procurement
A fork in the road with one path marked automation and one marked human review
Jul 4, 2026 · 8 min

When not to use AI agents

Gartner expects over 40% of agentic AI projects to be canceled by 2027. A practical four-question test for spotting tasks where an agent is the wrong tool.

AI agents / risk
Diagram showing a user device connecting to a managed AI agent workspace within an enterprise AI factory.
Jun 29, 2026 · 11 min

How to safely run AI agents in your business

AI agents can boost productivity by 37%, but they need strict governance to protect sensitive data and systems. Learn how to control them.

AI agents / enterprise AI
Diagram showing an AI agent system for compliance with human oversight
Jun 29, 2026 · 8 min

Stripe's lesson: Why focused AI agents excel in compliance

Stripe handles $1.4 trillion in payments annually. Learn how they use AI agents to cut compliance review time by 26% while keeping humans in control.

AI agents / Financial Compliance
Diagram showing an AI agent oversharing sensitive data with external tools.
Jun 29, 2026 · 6 min

Why your AI assistant might be sharing too much private data

New research reveals that 9 widely used AI agents often overshare private business data, even when completing tasks successfully, posing a significant risk.

AI agents / data privacy
Diagram showing Cara's AI architecture on AWS
Jun 26, 2026 · 7 min

How insurance brokerages are using AI to get work done faster

Insurance brokerages are saving about 10 hours per user per week with AI that understands their specific business needs, not just general chat.

AI / insurance
How companies actually get value from AI
Jun 16, 2026 · 6 min

How companies actually get value from AI

A plain guide to what a company has to figure out before AI pays off, built around three questions every business is asking about it right now.

enterprise AI / AI transformation
CEO-Bench: can AI agents run a company for 500 days?
Jun 15, 2026 · 6 min

CEO-Bench: can AI agents run a company for 500 days?

A Princeton test puts AI agents in charge of a fake software company for 500 days. Most went broke. Two finished rich. Here is what that tells you.

AI agents / benchmarks
Why AI agents fail in production and how failure detection fixes it
Jun 15, 2026 · 7 min

Why AI agents fail in production and how failure detection fixes it

When an AI agent gets something wrong, the mistake usually hides several steps back. A new AWS tool reads the agent's own logs and tells you which step broke and why.

AI agents / observability
How Rocket Close cut title work with an AI that takes actions
Jun 12, 2026 · 7 min

How Rocket Close cut title work with an AI that takes actions

A real company put an AI agent on its slowest, most paperwork-heavy task and cut contact center calls and emails by 30 percent. Here is what it did, in plain terms.

AI agents / agentic AI
How to tell if an AI agent is actually working
Jun 11, 2026 · 6 min

How to tell if an AI agent is actually working

A right answer can hide a broken AI agent. A new AWS toolkit checks the steps, not just the final reply, and one test scored faithfulness at 32 percent.

AI agents / AI evaluation